/* $NetBSD: rndc-confgen.c,v 1.6.2.1 2024/02/25 15:43:00 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ /*! \file */ /** * rndc-confgen generates configuration files for rndc. It can be used * as a convenient alternative to writing the rndc.conf file and the * corresponding controls and key statements in named.conf by hand. * Alternatively, it can be run with the -a option to set up a * rndc.key file and avoid the need for a rndc.conf file and a * controls statement altogether. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "keygen.h" #include "util.h" #define DEFAULT_KEYNAME "rndc-key" #define DEFAULT_SERVER "127.0.0.1" #define DEFAULT_PORT 953 static char program[256]; const char *progname; bool verbose = false; const char *keyfile, *keydef; noreturn static void usage(int status); static void usage(int status) { fprintf(stderr, "\ Usage:\n\ %s [-a] [-b bits] [-c keyfile] [-k keyname] [-p port] \ [-s addr] [-t chrootdir] [-u user]\n\ -a: generate just the key clause and write it to keyfile (%s)\n\ -A alg: algorithm (default hmac-sha256)\n\ -b bits: from 1 through 512, default 256; total length of the secret\n\ -c keyfile: specify an alternate key file (requires -a)\n\ -k keyname: the name as it will be used in named.conf and rndc.conf\n\ -p port: the port named will listen on and rndc will connect to\n\ -q: suppress printing written key path\n\ -s addr: the address to which rndc should connect\n\ -t chrootdir: write a keyfile in chrootdir as well (requires -a)\n\ -u user: set the keyfile owner to \"user\" (requires -a)\n", progname, keydef); exit(status); } int main(int argc, char **argv) { bool show_final_mem = false; isc_buffer_t key_txtbuffer; char key_txtsecret[256]; isc_mem_t *mctx = NULL; isc_result_t result = ISC_R_SUCCESS; const char *keyname = NULL; const char *serveraddr = NULL; dns_secalg_t alg; const char *algname; char *p; int ch; int port; int keysize = -1; struct in_addr addr4_dummy; struct in6_addr addr6_dummy; char *chrootdir = NULL; char *user = NULL; bool keyonly = false; bool quiet = false; int len; keydef = keyfile = RNDC_KEYFILE; result = isc_file_progname(*argv, program, sizeof(program)); if (result != ISC_R_SUCCESS) { memmove(program, "rndc-confgen", 13); } progname = program; keyname = DEFAULT_KEYNAME; alg = DST_ALG_HMACSHA256; serveraddr = DEFAULT_SERVER; port = DEFAULT_PORT; isc_commandline_errprint = false; while ((ch = isc_commandline_parse(argc, argv, "aA:b:c:hk:Mmp:r:s:t:u:Vy")) != -1) { switch (ch) { case 'a': keyonly = true; break; case 'A': algname = isc_commandline_argument; alg = alg_fromtext(algname); if (alg == DST_ALG_UNKNOWN) { fatal("Unsupported algorithm '%s'", algname); } break; case 'b': keysize = strtol(isc_commandline_argument, &p, 10); if (*p != '\0' || keysize < 0) { fatal("-b requires a non-negative number"); } break; case 'c': keyfile = isc_commandline_argument; break; case 'h': usage(0); case 'k': case 'y': /* Compatible with rndc -y. */ keyname = isc_commandline_argument; break; case 'M': isc_mem_debugging = ISC_MEM_DEBUGTRACE; break; case 'm': show_final_mem = true; break; case 'p': port = strtol(isc_commandline_argument, &p, 10); if (*p != '\0' || port < 0 || port > 65535) { fatal("port '%s' out of range", isc_commandline_argument); } break; case 'q': quiet = true; break; case 'r': fatal("The -r option has been deprecated."); break; case 's': serveraddr = isc_commandline_argument; if (inet_pton(AF_INET, serveraddr, &addr4_dummy) != 1 && inet_pton(AF_INET6, serveraddr, &addr6_dummy) != 1) { fatal("-s should be an IPv4 or IPv6 address"); } break; case 't': chrootdir = isc_commandline_argument; break; case 'u': user = isc_commandline_argument; break; case 'V': verbose = true; break; case '?': if (isc_commandline_option != '?') { fprintf(stderr, "%s: invalid argument -%c\n", program, isc_commandline_option); usage(1); } else { usage(0); } break; default: fprintf(stderr, "%s: unhandled option -%c\n", program, isc_commandline_option); exit(1); } } argc -= isc_commandline_index; argv += isc_commandline_index; POST(argv); if (argc > 0) { usage(1); } if (alg == DST_ALG_HMACMD5) { fprintf(stderr, "warning: use of hmac-md5 for RNDC keys " "is deprecated; hmac-sha256 is now " "recommended.\n"); } if (keysize < 0) { keysize = alg_bits(alg); } algname = dst_hmac_algorithm_totext(alg); isc_mem_create(&mctx); isc_buffer_init(&key_txtbuffer, &key_txtsecret, sizeof(key_txtsecret)); generate_key(mctx, alg, keysize, &key_txtbuffer); if (keyonly) { write_key_file(keyfile, chrootdir == NULL ? user : NULL, keyname, &key_txtbuffer, alg); if (!quiet) { printf("wrote key file \"%s\"\n", keyfile); } if (chrootdir != NULL) { char *buf; len = strlen(chrootdir) + strlen(keyfile) + 2; buf = isc_mem_get(mctx, len); snprintf(buf, len, "%s%s%s", chrootdir, (*keyfile != '/') ? "/" : "", keyfile); write_key_file(buf, user, keyname, &key_txtbuffer, alg); if (!quiet) { printf("wrote key file \"%s\"\n", buf); } isc_mem_put(mctx, buf, len); } } else { printf("\ # Start of rndc.conf\n\ key \"%s\" {\n\ algorithm %s;\n\ secret \"%.*s\";\n\ };\n\ \n\ options {\n\ default-key \"%s\";\n\ default-server %s;\n\ default-port %d;\n\ };\n\ # End of rndc.conf\n\ \n\ # Use with the following in named.conf, adjusting the allow list as needed:\n\ # key \"%s\" {\n\ # algorithm %s;\n\ # secret \"%.*s\";\n\ # };\n\ # \n\ # controls {\n\ # inet %s port %d\n\ # allow { %s; } keys { \"%s\"; };\n\ # };\n\ # End of named.conf\n", keyname, algname, (int)isc_buffer_usedlength(&key_txtbuffer), (char *)isc_buffer_base(&key_txtbuffer), keyname, serveraddr, port, keyname, algname, (int)isc_buffer_usedlength(&key_txtbuffer), (char *)isc_buffer_base(&key_txtbuffer), serveraddr, port, serveraddr, keyname); } if (show_final_mem) { isc_mem_stats(mctx, stderr); } isc_mem_destroy(&mctx); return (0); }